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Article Dans Une Revue Applied optics Année : 2022

Multipass lock-in thermography for the study of optical coating absorption

Résumé

The development of high-power lasers requires optics with very low absorption to avoid detrimental thermal effects. In this work, we discuss our recent developments on the use of lock-in thermography to measure absorption. We apply this technique in a multipass configuration to increase the effective power on the tested samples. We present a system based on a kW-class ytterbium fiber laser operating at 1.07 µm wavelength, which enables exposing samples to 5 kW effective power and measuring absorption in the ppm range. The implementation, calibration procedure, and obtained performance are discussed with some applications to single-layer coatings of H f O 2 , T a 2 O 5 , T i O 2 , N b 2 O 5 , and S i O 2 deposited by plasma-assisted electron beam deposition.
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Dates et versions

hal-03751028 , version 1 (13-08-2022)

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Camille Petite, Rémi Marcouillé, Antonin Moreau, Hélène Krol, Catherine Grèzes-Besset, et al.. Multipass lock-in thermography for the study of optical coating absorption. Applied optics, 2022, 61 (4), pp.978. ⟨10.1364/AO.445045⟩. ⟨hal-03751028⟩
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